Finding the Fourth Proportional to 9,003.28, 12,419.34 and 5,415.74

Step by Step Solution

1. Step 1: Write the proportion equation
   9,003.28 : 12,419.34 = 5,415.74 : x
2. Step 2: Convert to fraction form
   9,003.28/12,419.34 = 5,415.74/x
3. Step 3: Cross multiply
   9,003.28x = 12,419.34 × 5,415.74
4. Step 4: Simplify right side
   9,003.28x = 67,259,916.41
5. Step 5: Solve for x
   x = 67,259,916.41/9,003.28
6. Step 6: Final answer
   x = 7,470.60